pyridinium p-toluenesulfonate T=25°C;

pyridinium p-toluenesulfonate T=25°C; 53 h;

pyridinium chlorochromate in dichloromethane T=25°C; 4 h; Title compound not separated from byproducts;

in diethyl ether; hexane; toluene

1: (5R)-5-(2-hydroxyethyl)-2,2-dimethyl-1,3-dioxolan-4-one With pyridinium chlorochromate in dichloromethane T=25°C; 4 h; 2: (S)-2-amino-4-methyl-pentanoic acid benzyl ester With acetic acid in methanol 0.5 h; 3: With sodium cyanoborohydride in methanol T=25°C; 3 h;

1: With diborane in tetrahydrofuran Inert atmosphere; 2: With toluene-4-sulfonic acid in benzene Inert atmosphere;